2201978 has 8 divisors (see below), whose sum is σ = 3357300. Its totient is φ = 1082880.

The previous prime is 2201977. The next prime is 2201989. The reversal of 2201978 is 8791022.

It is a happy number.

2201978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2181529 + 20449 = 1477^2 + 143^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2201978² = 9697414224968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2201978.

It is not an unprimeable number, because it can be changed into a prime (2201971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8903 + ... + 9146.

2^2201978 is an apocalyptic number.

2201978 is a deficient number, since it is larger than the sum of its proper divisors (1155322).

2201978 is a wasteful number, since it uses less digits than its factorization.

2201978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18112.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 2201978 is about 1483.9063312757. The cubic root of 2201978 is about 130.0981113408.

The spelling of 2201978 in words is "two million, two hundred one thousand, nine hundred seventy-eight".